CN103781165A - Transmit power control method for wireless local area network , controller and access point - Google Patents

Transmit power control method for wireless local area network , controller and access point Download PDF

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Publication number
CN103781165A
CN103781165A CN201210417328.4A CN201210417328A CN103781165A CN 103781165 A CN103781165 A CN 103781165A CN 201210417328 A CN201210417328 A CN 201210417328A CN 103781165 A CN103781165 A CN 103781165A
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CN
China
Prior art keywords
described
ap
transmitting power
radio frequency
frequency unit
Prior art date
Application number
CN201210417328.4A
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Chinese (zh)
Inventor
王云贵
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华为技术有限公司
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Priority to CN201210417328.4A priority Critical patent/CN103781165A/en
Publication of CN103781165A publication Critical patent/CN103781165A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/24TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/36TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367Power values between minimum and maximum limits, e.g. dynamic range
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/386TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/20TPC being performed according to specific parameters using error rate

Abstract

This invention discloses a transmit power control method for a wireless local area network, a controller and an access point. The transmit power control method for the wireless local area network comprises: the controller determines transmitted power range of a radio frequency unit of a first access point AP; the controller receives and transmits information according to the message of the radio frequency unit reported by the first access point AP and determines the message transmit-receiver parameter of each user link; the controller perform transmission power configuration for each user link of the radio frequency unit within the transmitted power range according to the determined message transmit-receiver message parameter of each user link in the radio frequency unit. The invention can specifically reduce the interference between devices in WLAN while not reducing the AP and transmitting data, and improve the transmission performance of the WLAN system.

Description

Transmit power controlling method, controller and the access point of WLAN (wireless local area network)

Technical field

The invention belongs to wireless communication technology field, relate in particular to transmit power controlling method, controller and the access point (Access Point, AP) of a kind of WLAN (wireless local area network) (Wireless Local Area Network, WLAN).

Background technology

Along with the develop rapidly of wireless communication technology, WLAN based on IEEE-USA (Institute of Electrical and Electronics Engineers, IEEE) 802.11 series standards has been widely used in the regions such as family, office and public place.Between adjacent channel due to wireless frequency spectrum, all overlap, therefore, having disposed in the WLAN of a large amount of AP, between AP, inevitably can produce phase mutual interference, cause transceiving data failure.Conventionally in order to avoid interference (or increasing covering), can carry out transmitting power adjustment (Transmit Power Change, TPC).

Existing TPC scheme is only for the same access controller of access (Access Controller, AC) each AP carries out transmitting power adjustment, but, when AP 1 and AP 2 are when all the user of distal-most end carries out transfer of data in coverage separately with it, the overlay area of AP 1 and AP 2 has overlapping very greatly, between these two AP, produces phase mutual interference; And in the time that AP 1 and AP 2 all carry out transfer of data with its closely user separately, but non-overlapping copies of the overlay area of two AP, can not produce phase mutual interference, but obviously, existing TPC scheme cannot be carried out TPC for transfer of data scenes different between AP and user, can only unify to adjust the transmitting power of AP, reduce the ability of AP concurrent data transmission, thereby reduce the system transmission performance of WLAN.

Summary of the invention

The object of the embodiment of the present invention is to provide a kind of transmit power controlling method, controller and access point of WLAN (wireless local area network), be intended to solve the transmitting power that existing TPC scheme can only unify to adjust AP, reduce the ability of AP concurrent data transmission, caused the low problem of system transmission performance of WLAN.

First aspect, the transmit power controlling method of described WLAN (wireless local area network) comprises: controller is determined the transmitting power scope of the radio frequency unit of the first access point AP; The packet sending and receiving information of the described radio frequency unit that described controller reports according to a described AP, determines the packet sending and receiving parameter of every user link of described radio frequency unit; Described controller is according to the packet sending and receiving parameter of every user link in the described radio frequency unit of determining, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.

In the possible implementation of the first of first aspect, described controller determines that the transmitting power scope of the radio frequency unit of an AP comprises: described controller is determined the 2nd maximum AP of received signal strength indicator symbol RSSI value of the signal that receives described radio frequency unit; Described controller obtains the average attenuation between a described AP and described the 2nd AP; Described controller, according to the default power threshold of described average attenuation and a described AP, is determined the transmitting power scope of described radio frequency unit.

In conjunction with the possible implementation of the first of first aspect or first aspect, in the possible implementation of the second, before the packet sending and receiving parameter of every user link of determining described radio frequency unit, also comprise: described controller is the default transmitting power of described radio frequency unit configuration, so that described radio frequency unit utilizes described default transmitting power to send message, described default transmitting power is positioned at described transmitting power scope.

Second aspect, the transmit power controlling method of described wireless network, is characterized in that, comprising: access point AP receives the transmitting power scope of the radio frequency unit of the described AP of controller transmission; Described AP, according to the packet sending and receiving information of described radio frequency unit, determines the packet sending and receiving parameter of every user link in described radio frequency unit; Described AP is according to described packet sending and receiving parameter, and every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.

In the possible implementation of the first of second aspect, at described AP according to the packet sending and receiving information of described radio frequency unit, before determining the packet sending and receiving parameter of every user link in described radio frequency unit, also comprise: described AP determines described default transmitting power within the scope of described transmitting power; Described AP utilizes described default transmitting power to send message on described radio frequency unit.

The third aspect, described controller comprises: power bracket determining unit, for determining the transmitting power scope of radio frequency unit of the first access point AP; Parameter determining unit, for the packet sending and receiving information of the described radio frequency unit that reports according to a described AP, determines the packet sending and receiving parameter of every user link of described radio frequency unit; Dispensing unit, for receiving described transmitting power scope from described power bracket determining unit, the packet sending and receiving parameter of every user link the described radio frequency unit of determining from described parameter determining unit reception, according to the packet sending and receiving parameter of every user link in the described radio frequency unit of determining, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.

In the possible implementation of the first of the third aspect, described power bracket determining unit comprises: the 2nd AP determines subelement, for determining the 2nd maximum AP of received signal strength indicator symbol RSSI value of the signal that receives described radio frequency unit; Obtain subelement, for determining that from described the 2nd AP subelement receives described the 2nd AP, obtain the average attenuation between a described AP and described the 2nd AP; Power bracket is determined subelement, for receiving described average attenuation from the described subelement that obtains, according to the default power threshold of described average attenuation and a described AP, determines the transmitting power scope of described radio frequency unit.

In conjunction with the possible implementation of the first of the third aspect or the third aspect, in the possible implementation of the second, also comprise: pre-configured unit, for receiving described transmitting power scope from described power bracket determining unit, for the default transmitting power of described radio frequency unit configuration, so that described radio frequency unit utilizes described default transmitting power to send message, described default transmitting power is positioned at described transmitting power scope.

Fourth aspect, described access point AP comprises: receiving element, for receiving the transmitting power scope of radio frequency unit of the described AP that controller sends; Parameter determining unit, for according to the packet sending and receiving information of described radio frequency unit, determines the packet sending and receiving parameter of every user link in described radio frequency unit; Dispensing unit, for receiving described transmitting power scope from described receiving element, receive described packet sending and receiving parameter from described parameter determining unit, according to described packet sending and receiving parameter, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.

In the possible implementation of the first of fourth aspect, also comprise: pre-configured unit, for determine described default transmitting power within the scope of described transmitting power; Transmitting element for receiving described default transmitting power from described pre-configured unit, utilizes described default transmitting power to send message on described radio frequency unit.

In embodiments of the present invention, by determining the transmitting power scope of AP, and within the scope of this transmitting power, dynamically determine the transmitting power of AP in this user link according to the packet sending and receiving situation of every user link of AP, in not reducing AP concurrent data transmittability, reduce targetedly the signal between equipment in WLAN and disturbed, improved the system transmission performance of WLAN.

Accompanying drawing explanation

Fig. 1 is the applicable system architecture diagram of transmit power controlling method of the WLAN that provides of the embodiment of the present invention;

Fig. 2 is the realization flow figure of the transmit power controlling method of a kind of WLAN of providing of the embodiment of the present invention;

Fig. 3 is the specific implementation flow chart of the transmit power controlling method 201 of the WLAN that provides of the embodiment of the present invention;

Fig. 4 is the transmit power controlling method transmitting power scope schematic diagram of the WLAN that provides of the embodiment of the present invention;

Fig. 5 is the information interaction schematic diagram of the transmit power controlling method of the WLAN that provides of the embodiment of the present invention;

Fig. 6 is the realization flow figure of the transmit power controlling method of the another kind of WLAN that provides of the embodiment of the present invention;

Fig. 7 is the structured flowchart of the controller that provides of the embodiment of the present invention;

Fig. 8 is the structured flowchart of the controller that provides of another embodiment of the present invention;

Fig. 9 is the structured flowchart of the AP that provides of the embodiment of the present invention;

The structured flowchart of the AP that Figure 10 another embodiment of the present invention provides;

Figure 11 is the hardware block diagram of the controller that provides of the embodiment of the present invention;

Figure 12 is the hardware block diagram of the AP that provides of the embodiment of the present invention.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

In embodiments of the present invention, by determining the transmitting power scope of AP, and within the scope of this transmitting power, dynamically determine the transmitting power of AP in every user link according to the packet sending and receiving situation of every user link of AP, having reduced targetedly the signal between equipment in WLAN disturbs, do not affect the ability of AP concurrent data transmission, improved the system transmission performance of WLAN simultaneously.

In embodiments of the present invention, controller carries out TPC to AP, and its AP that carries out TPC can select at random to obtain for controller in any one AP of access WLAN, can be also the most serious AP that is disturbed of current this controller of access, in this no limit.

The applicable system architecture diagram of related embodiment of the present invention as shown in Figure 1, this system is based on existing wlan network framework, AC 11, AP 12 and website 13 are mainly comprised, wherein, AC 11 is responsible, and the AP 12 that at least one is accessed to this WLAN manages control and business configuration, and AP 12 also supports automatically to be found by AC 11.Particularly, in embodiments of the present invention, cover the situation of multiple websites 13 for AP 12, can carry out transmitting power configuration to every user link of AP 12.

Next the transmit power controlling method of the WLAN, first take controller as executive agent, the embodiment of the present invention being provided is described in detail:

Fig. 2 shows the realization flow of the transmit power controlling method of a kind of WLAN that the embodiment of the present invention provides, in embodiments of the present invention, controller can be arranged in the AC 11 of Fig. 1, also can be arranged in the network of relation management equipment of the wlan network framework shown in Fig. 1, and described method comprises:

201, controller is determined the transmitting power scope of the radio frequency unit of an AP.

In an AP, can there is one or more radio frequency unit, each radio frequency unit is assigned with and is operated in different channels.Radio frequency unit can with the devices such as other radio frequency unit common antenna, central processing unit (Centre Process Unit, CPU), also can possess its special device such as antenna, CPU.Therefore, in the present embodiment, in the time that AP only possesses a radio frequency unit, the transmitting power scope of the AP that controller is determined is the transmitting power scope of this radio frequency unit, in the time that AP possesses multiple radio frequency unit, controller is determined respectively the transmitting power scope of each radio frequency unit of AP.

In the present embodiment, the transmitting power scope of determining can represent with multi-form: for example, and p, x} represents that the center transmitting power of radio frequency unit is p decibel (Decibel, dB), the transmitting power Ke Gai center transmitting power of the different user link x dB that fluctuates; Again for example, [s, e] represents that the maximum transmission power of radio frequency unit is e dB, and minimum emissive power is s dB, and the transmitting power of user link can be between s dB and e dB.Meanwhile, transmitting power scope also can represent by power level, for example, transmitting power is divided into 10 grades, grade 1 is the highest, corresponding transmitting power 20 decibels above milliwatts (Decibel Miliwatt, dBm), grade 10 is minimum, 10dBm, the difference between every two ranks is 1dBm, can represent transmitting power scope by power level scope, be mapped to concrete transmitting power by power rank again, do not limit one by one at this.

In the present embodiment, the transmitting power scope that can determine according to the disturbed condition between an AP and other the 2nd AP and overlapping coverage condition the radio frequency unit of an AP, concrete transmitting power scope determines that method will be elaborated in subsequent embodiment.

202, the packet sending and receiving information of this radio frequency unit that controller reports according to an AP, determines the packet sending and receiving parameter of every user link of this radio frequency unit.

In the present embodiment, the radio frequency unit of the one AP can utilize its current transmitting power to send message in its every user link, also can be before 202, send a default transmitting power by controller to this radio frequency unit, make this radio frequency unit utilize this default transmitting power to send message in its every user link, the packet sending and receiving information of this radio frequency unit that then controller reception the one AP reports, wherein, default transmitting power is the arbitrary transmitting power within the scope of transmitting power definite in 201, for example, this transmitting power scope Nei center transmitting power.

In the time that website is linked into AP, being connected between website and AP be called user link.In the present embodiment, send to each website in the process of message by different user link at AP, can be periodically to the relevant packet sending and receiving information of controller report, according to receiving and sending messages of receiving, controller can get by calculating the packet sending and receiving parameter of every user link in this radio frequency unit, wherein, packet sending and receiving parameter comprises bit error rate (the Byte Error Rate of user link, BER), message error rate (Packet ErrorRate, PER), user link and other user link are received and dispatched any one in total error ratio of message simultaneously.

203, according to the packet sending and receiving parameter of every user link in definite radio frequency unit, every the user link that is respectively this radio frequency unit within the scope of transmitting power is carried out transmitting power configuration.

In the present embodiment, controller, according to the packet sending and receiving parameter of the radio frequency unit of AP, carries out transmitting power to the user link of this AP transmission message and reshuffles, particularly, controller carries out transmitting power according to packet sending and receiving parameter to user link reshuffles, can be with reference to following principle:

(1) packet sending and receiving parameter be BER(PER)

Controller judges whether BER is greater than a BER(PER) threshold value, be the transmitting power that improves corresponding user link within the scope of transmitting power, for example, in the time that BER is greater than a BER threshold value, according to preset rules, the transmitting power of user link is improved to 2dB; And

Controller judges whether BER is less than the 2nd BER(PER) threshold value is the transmitting power that reduces corresponding user link within the scope of transmitting power.

(2) packet sending and receiving parameter is total error ratio that user link and other user link are received and dispatched message simultaneously

Controller is got user link and other user link and is received and dispatched simultaneously total error ratio of message by transmitting-receiving statistical information, when total error ratio is less than the first ratio threshold value, for example, while being less than 2%, represent that this user link is very little on the impact of other user link, controller improves the transmitting power of this user link within the scope of transmitting power; In the time that total error rate is greater than the second ratio threshold value, for example, while being greater than 9%, represent that this user link is larger on the impact of other user link, controller reduces the transmitting power of this user link within the scope of transmitting power, to reduce the transmitting power of this user link to the interference of other user link.

It should be noted that, mentioned above principle is only for illustrating several situations of the transmitting power of user link being reshuffled according to packet sending and receiving parameter, actual reshuffle principle and can be not limited to mentioned above principle, and the size that transmitting power is adjusted can be by systemic presupposition, also can determine according to the packet sending and receiving situation realizing, be not used in restriction the present invention at this.

Thus, after controller is reshuffled the transmitting power of user link, the transmitting power of reshuffling is sent to an AP, so that an AP utilizes the transmitting power of reshuffling to carry out message transmissions in corresponding user link.

In the present embodiment, controller can dynamically be adjusted the transmitting power of user link within the scope of the transmitting power of the radio frequency unit of determining according to the message transmission situation of every user link of radio frequency unit, to the transmitting power adjustment that becomes more meticulous, reduce targetedly the situation of phase mutual interference between AP, do not affect the concurrent data transmittability of AP, improved the transmission performance of wireless network simultaneously.

In embodiments of the present invention, particularly, can determine according to the disturbed condition between this AP and other AP and overlapping coverage condition the transmitting power scope of the radio frequency unit of this AP.Fig. 3 shows in the transmit power controlling method of the WLAN that the embodiment of the present invention provides 201 specific implementation flow process, and details are as follows:

301, controller is determined the 2nd maximum AP of received signal strength indicator symbol (Receive Signal Strength Indicator, RSSI) value of the signal that receives an AP.

In the present embodiment, can be in advance send detect-message by an AP to each the 2nd AP, and return to corresponding detection by the 2nd AP and respond, make controller get each the 2nd AP to receive the RSSI of an AP signal.

Wherein, the 2nd AP can be the neighbor AP of the first AP, and the 2nd AP is the opposite end AP that the wireless signal of an AP transmitting can reach, and/or transmits and can reach the opposite end AP of an AP.

302, controller obtains the average attenuation between an AP and the 2nd AP.

Wherein, the corresponding power of RSSI value of AP that pad value can receive by the transmitting power of the AP transmitting is deducted signal obtain, and average attenuation is by accessed mean value after above-mentioned pad value repeatedly being tested in radio signal transmission process repeatedly.

In the present embodiment, the average attenuation that controller gets be between the 2nd AP by determining in an AP and 401 repeatedly mutually emitting radio frequency signal measure, and measured value has comprised the pad value of the radiofrequency signal being received by an AP transmitting, the 2nd AP, and the pad value of the radiofrequency signal being received by the 2nd AP transmitting, an AP.

303, controller, according to the default power threshold of this average attenuation and an AP, is determined the transmitting power scope of radio frequency unit.

Particularly, the default power threshold of AP can be got according to relevant network configuration information by controller, and default power threshold has comprised maximum power threshold and minimum power threshold, wherein, about maximum power threshold, in the time that this AP use exceedes this maximum power threshold emitting radio frequency signal, can make the AP that receives this radiofrequency signal be subject to severe jamming, cannot normally work; About minimum power threshold, it is expressed as in network design planning, corresponding minimum emissive power while needing overlapping covering between two AP.

After getting above-mentioned average attenuation, maximum power threshold and minimum power threshold, controller can determine according to above-mentioned three parameters the transmitting power scope of this AP.For example, the transmitting power scope of this AP can be [minimum power threshold+average attenuation/2, maximum power threshold-average attenuation], as shown in Figure 4, in figure, the dash area between maximum power threshold and the minimum power threshold of AP is the transmitting power scope of the AP determining by above-mentioned steps.

It should be noted that, in actual network operation process, controller can, according to the real-time disturbed condition between current offered load situation and each AP, come transmitting power scope to do further to adjust based on above-mentioned three parameters, in this no limit.

Particularly, referring to the information interaction schematic diagram of the transmit power controlling method of the WLAN shown in 5, according to mutually sending message between controller, an AP and the 2nd AP and returning to response, determine the 2nd maximum AP of RSSI value of the signal that receives an AP, and get the average attenuation between an AP and the 2nd AP, as shown in Figure 5:

501, controller sends scanning indication to an AP, and radio frequency unit mark and transmitting power have been carried in this scanning indication.

In the present embodiment, scanning indication is used to indicate an AP and broadcasts neighbor request message to each the 2nd AP on the radio frequency unit of the transmitting power of specifying and appointment, wherein, the transmitting power of specifying in scanning indication can comprise the transmitting power of one or more rank, for example maximum transmission power and general transmit power (half of maximum transmission power), in the time that the transmitting power of specifying in scanning indication is multiple rank, the one AP need to be respectively in the transmitting power of these multiple ranks, utilizes the radio frequency unit of specifying to send neighbor request message.

In the present embodiment, controller can all send corresponding scanning indication to all AP in its control range, and as one embodiment of the present of invention, in this scanning indication except comprising the radio frequency unit mark of transmitting power that controller is specified to an AP and appointment, can also comprise AP mark, and the duration of beacon scanning, wherein, AP mark for disposing under the application scenarios of multiple virtual AP on a physics AP, identify certain virtual AP on an AP, be used to indicate the broadcast duration that an AP sends neighbor request message duration scanning, because an AP cannot be known the existence that has how many 2nd AP, therefore, by the beacon scanning duration, avoid an AP to broadcast for a long time.

502, an AP sends neighbor request message with the radio frequency unit of this radio frequency unit mark indication to each the 2nd AP in this transmitting power.

The one AP is after the scanning indication that receives controller, be switched to neighbours' acquisition mode by its operating state by normal data transmission state, broadcast neighbor request message according to scanning indication to the 2nd AP, in the neighbor request message sending at an AP, carry the basic service set identification (Basic Service Set Identifier, BSSID) of an AP and the transmitting power (i.e. transmitting power of specifying in scanning indication) of AP transmitting neighbor request message.

503, the 2nd AP, according to the neighbor request message receiving, calculates a RSSI of the signal that receives an AP.

The 2nd AP is receiving after the neighbor request message of an AP, launches the transmitting power of this neighbor request message according to an AP who carries in the signal power receiving and neighbor request message, calculates a RSSI who receives an AP signal.

504, the 2nd AP sends response to an AP, and sends neighbours' report message to controller.

Wherein, BSSID and the transmitting power that in the response sending to an AP, can carry the 2nd AP, receive the RSSI of the signal of the 2nd AP so that an AP, according to the power of the signal of this transmitting power and the 2nd AP that receives thereof, calculates an AP; On the other hand, the 2nd AP sends neighbours' report message to controller, in this neighbours' report message, carried BSSID, transmitting power and the channel logo of the 2nd AP by an AP who gets in neighbor request message, and the BSSID of the 2nd AP self and the 2nd AP receive the RSSI of the signal of an AP.

In the present embodiment, the 2nd AP returns to corresponding response message and sends neighbours' report message to controller to an AP, can adopt the transmitting power of system default to send, if configured transmitting power scope for the 2nd AP, the 2nd AP also can adopt the determined maximum transmission power of this transmitting power scope to send.

505, the response that an AP returns according to the 2nd AP, calculates an AP and receives the RSSI of the signal of the 2nd AP.

506, an AP sends neighbours' report message to controller.

Wherein, in neighbours' report message that an AP sends, the BSSID of the BSSID of an AP and radio frequency unit mark, the 2nd AP and radio frequency unit mark and an AP have been carried and have received the RSSI of the signal of the 2nd AP.

507, controller, according to neighbours' report message of an AP and the 2nd AP transmission, is determined the 2nd maximum AP of RSSI value that receives an AP, and is calculated the average attenuation between an AP and the 2nd AP.

It should be noted that, for an AP, in the time that controller has been specified multiple channels of this AP and the transmitting power of multiple ranks, it need to utilize each transmitting power of specifying to come its neighbor AP broadcast neighbor request message on all channels of specifying.

In embodiments of the present invention, by determining the transmitting power scope of AP, and within the scope of this transmitting power, dynamically determine the transmitting power of AP in every user link according to the packet sending and receiving information of every user link of AP, having reduced targetedly the signal between equipment in WLAN disturbs, do not affect the concurrent data transmittability of AP, improved the system transmission performance of WLAN simultaneously.

In addition, as one embodiment of the present of invention, controller can also directly send definite transmitting power scope in 201 to an AP, so that an AP can carry out the configuration of transmitting power to the user link that sends message according to the packet sending and receiving information of self, the concrete principle that realizes will be described in detail in the embodiment take AP as executive agent shown in subsequent figure 6.

Next the transmit power controlling method of the WLAN, take AP as executive agent, the embodiment of the present invention being provided is described in detail:

Fig. 6 shows the realization flow of the transmit power controlling method of the another kind of WLAN that the embodiment of the present invention provides, and in the present embodiment, the executive agent of flow process is AP, and details are as follows:

601, AP receives the transmitting power scope of the radio frequency unit of controller transmission.

In the present embodiment, determined the transmitting power scope of the radio frequency unit of this AP according to the disturbed condition between this AP and other AP and overlapping coverage condition by controller, concrete transmitting power scope determines that method is elaborated in the detailed process of 201 shown in previous embodiment Fig. 2, does not repeat them here.

602, AP, according to the packet sending and receiving information of this radio frequency unit, determines the packet sending and receiving parameter of every user in this radio frequency unit.

In the present embodiment, send to each website in the process of message by different user link at AP, can get relevant packet sending and receiving information, AP can calculate the packet sending and receiving parameter that gets every user link in this radio frequency unit according to packet sending and receiving information, wherein, packet sending and receiving parameter comprises that BER, PER, user link and other user link of this user link receive and dispatch any one in total error ratio of message simultaneously.

603, AP is according to packet sending and receiving parameter, and every the user link that is respectively this radio frequency unit within the scope of transmitting power is carried out transmitting power configuration.

In the present embodiment, by AP according to the packet sending and receiving parameter of radio frequency unit, the user link that this radio frequency unit is sent to message is carried out transmitting power and is reshuffled, and particularly, according to packet sending and receiving parameter, user link being carried out to transmitting power reshuffles can be with reference to following principle:

(1) packet sending and receiving parameter be BER(PER)

AP judges whether BER is greater than a BER(PER) threshold value, be the transmitting power that improves corresponding user link within the scope of transmitting power, for example, in the time that BER is greater than a BER threshold value, according to preset rules, the transmitting power of user link is improved to 2dB; And

AP judges whether BER is less than the 2nd BER(PER) threshold value is the transmitting power that reduces corresponding user link within the scope of transmitting power.

(2) packet sending and receiving parameter is total error ratio that user link and other user link are received and dispatched message simultaneously

AP receives and dispatches total error ratio of message simultaneously to user link and other user link by packet sending and receiving acquisition of information, when total error ratio is less than the first ratio threshold value, for example, while being less than 2%, represent that this user link is very little on the impact of other user link, AP improves the transmitting power of this user link within the scope of transmitting power; In the time that total error rate is greater than the second ratio threshold value, for example, while being greater than 9%, represent that this user link is larger on the impact of other user link, AP reduces the transmitting power of this user link within the scope of transmitting power, to reduce the transmitting power of this user link to the interference of other user link.

It should be noted that, mentioned above principle is only for illustrating several situations of the transmitting power of user link being reshuffled according to packet sending and receiving parameter, actual reshuffle principle and can be not limited to mentioned above principle, and the size that transmitting power is adjusted can be by systemic presupposition, also can determine according to the packet sending and receiving situation realizing, be not used in restriction the present invention at this.

In the present embodiment, after 601, before 602, preferably, AP can determine default transmitting power within the scope of the definite transmitting power of controller, for example, this transmitting power scope Nei center transmitting power, to send message, wherein in this default transmitting power, in the time that AP possesses multiple radio frequency unit, AP utilizes default transmitting power to send message on radio frequency unit corresponding to this default transmitting power.

In the present embodiment, different from Fig. 2 embodiment of the present invention, determine packet sending and receiving parameter by AP according to packet sending and receiving information, and according to packet sending and receiving parameter, the transmitting power of user link is configured, effectively reduce the information interaction between controller and AP.The related realization principle of the present embodiment can be embodiment illustrated in fig. 2 with reference to the present invention, do not repeat them here.

Fig. 7 shows the structured flowchart of the controller that the embodiment of the present invention provides, and this controller is for moving the transmit power controlling method described in Fig. 2 to Fig. 5 embodiment of the present invention.For convenience of explanation, only show the part relevant to the present embodiment.As shown in Figure 7, described controller comprises:

Power bracket determining unit 71, determines the transmitting power scope of the radio frequency unit of an AP.

In the present embodiment, in the time that AP only possesses a radio frequency unit, the transmitting power scope of the AP that controller is determined is the transmitting power scope of this radio frequency unit, and in the time that AP possesses multiple radio frequency unit, controller is determined respectively the transmitting power scope of each radio frequency unit of AP.

In the present embodiment, the transmitting power scope that can determine according to the disturbed condition between an AP and other the 2nd AP and overlapping coverage condition the radio frequency unit of an AP, concrete transmitting power scope determines that method will be elaborated in subsequent embodiment.

Parameter determining unit 72, the packet sending and receiving information of the radio frequency unit reporting according to an AP, determines the packet sending and receiving parameter of every user link in radio frequency unit.

In the present embodiment, the radio frequency unit of the one AP can utilize its current transmitting power to send message in its every user link, also can send a default transmitting power to this radio frequency unit by controller, make this radio frequency unit utilize this default transmitting power to send message in its every user link, the packet sending and receiving information of this radio frequency unit that then controller reception the one AP reports, wherein, default transmitting power is the arbitrary transmitting power within the scope of the definite transmitting power of power bracket determining unit 81, for example, this transmitting power scope Nei center transmitting power.

In the present embodiment, send to each website in the process of message by different user link at AP, can be periodically to the relevant packet sending and receiving information of controller report, according to receiving and sending messages of receiving, controller can get by calculating the packet sending and receiving parameter of every user link in this radio frequency unit, wherein, packet sending and receiving parameter comprises that BER, PER, user link and other user link of user link receive and dispatch any one in total error ratio of message simultaneously.

Dispensing unit 73, receive transmitting power scope from power bracket determining unit 71, receive the packet sending and receiving parameter of every user link definite radio frequency unit from parameter determining unit 72, according to the packet sending and receiving parameter of every user link in definite radio frequency unit, every the user link that is respectively this radio frequency unit within the scope of transmitting power is carried out transmitting power configuration.

In the present embodiment, controller is according to the packet sending and receiving parameter of the radio frequency unit of AP, the user link of this AP transmission message is carried out to transmitting power reshuffles, particularly, controller carries out transmitting power according to packet sending and receiving parameter to user link and reshuffles, can be with reference to the correlation principle described in Fig. 2 embodiment of the present invention, and the correlation principle described in Fig. 2 embodiment of the present invention is only for illustrating several situations of the transmitting power of user link being reshuffled according to packet sending and receiving parameter, actual reshuffle principle and can be not limited to mentioned above principle, and the size that transmitting power is adjusted can be by systemic presupposition, also can determine according to the packet sending and receiving situation realizing, be not used in restriction the present invention at this.

Alternatively, as shown in Figure 8, power bracket determining unit 71 comprises:

The 2nd AP determines subelement 711, determines the 2nd maximum AP of RSSI value of the signal of received RF unit.

In the present embodiment, can be in advance send detect-message by an AP to each the 2nd AP, and return to corresponding detection by the 2nd AP and respond, make controller get each the 2nd AP to receive the RSSI of an AP signal.

Obtain subelement 712, determine that from the 2nd AP subelement 711 receives the 2nd AP, obtain the average attenuation between an AP and the 2nd AP.

In the present embodiment, the average attenuation that controller gets is by determining at an AP and the 2nd AP between the 2nd AP that subelement 711 determines that repeatedly emitting radio frequency signal measures mutually, and measured value has comprised the pad value of the radiofrequency signal being received by an AP transmitting, the 2nd AP, and the pad value of the radiofrequency signal being received by the 2nd AP transmitting, an AP.

Power bracket is determined subelement 713, receives average attenuation from obtaining subelement 712, according to the default power threshold of average attenuation and an AP, determines the transmitting power scope of radio frequency unit.

Particularly, the default power threshold of AP can be got according to relevant network configuration information by controller, and default power threshold has comprised maximum power threshold and minimum power threshold, after getting above-mentioned average attenuation, maximum power threshold and minimum power threshold, controller can determine according to above-mentioned three parameters the transmitting power scope of this AP.For example, the transmitting power scope of this AP can be [minimum power threshold+average attenuation/2, maximum power threshold-average attenuation].

Alternatively, controller also comprises:

Pre-configured unit 74, receives transmitting power scope from power bracket determining unit 71, is the default transmitting power of radio frequency unit configuration, so that the default transmitting power of radio frequency unit utilization sends message, default transmitting power is positioned at transmitting power scope.

Alternatively, packet sending and receiving parameter comprises any one in total error ratio when BER, the PER of user link or user link and other user link receive and dispatch message simultaneously.

Alternatively, controller is positioned at access controller AC.

Fig. 9 shows the structured flowchart of the AP that the embodiment of the present invention provides, and this AP is for moving the transmit power controlling method described in Fig. 6 embodiment of the present invention.For convenience of explanation, only show the part relevant to the present embodiment.

As shown in Figure 9, described AP comprises:

Receiving element 901, the transmitting power scope of the radio frequency unit of this AP that reception controller sends.

In the present embodiment, determined the transmitting power scope of the radio frequency unit of this AP according to the disturbed condition between this AP and other AP and overlapping coverage condition by controller, concrete transmitting power scope determines that method is elaborated in the detailed process of 301 shown in previous embodiment Fig. 4, does not repeat them here.

Parameter determining unit 902, according to the packet sending and receiving information of radio frequency unit, determines the packet sending and receiving parameter of every user link in radio frequency unit.

In the present embodiment, send to each website in the process of message by different user link at AP, can get relevant packet sending and receiving information, AP can calculate the packet sending and receiving parameter that gets every user link in this radio frequency unit according to packet sending and receiving information, wherein, packet sending and receiving parameter comprises that BER, PER, user link and other user link of this user link receive and dispatch any one in total error ratio of message simultaneously.

Dispensing unit 903, receives transmitting power scope from receiving element 901, receives packet sending and receiving parameter from parameter determining unit 902, and according to packet sending and receiving parameter, every the user link that is respectively radio frequency unit within the scope of transmitting power is carried out transmitting power configuration.

In the present embodiment, by AP according to the packet sending and receiving parameter of radio frequency unit, the user link of this radio frequency unit transmission message is carried out to transmitting power reshuffles, particularly, according to packet sending and receiving parameter, user link being carried out to transmitting power reshuffles and can, with reference to the correlation principle of setting forth in Fig. 6 embodiment of the present invention, be not repeated herein.

Alternatively, as shown in figure 10, AP also comprises:

Default transmitting power is determined in pre-configured unit 904 within the scope of transmitting power.

Transmitting element 905, receives default transmitting power from pre-configured unit 904, utilizes default transmitting power to send message on radio frequency unit.

In the present embodiment, AP can determine default transmitting power within the scope of the definite transmitting power of controller, for example, this transmitting power scope Nei center transmitting power, to send message in this default transmitting power, wherein, in the time that AP possesses multiple radio frequency unit, AP utilizes default transmitting power to send message on radio frequency unit corresponding to this default transmitting power.

Figure 11 shows the hardware block diagram of the controller that the embodiment of the present invention provides, and this controller is for moving the transmit power controlling method described in Fig. 2 to Fig. 5 embodiment of the present invention.For convenience of explanation, only show the part relevant to the present embodiment.As shown in figure 11, described controller comprises: processor 1101, antenna 1102 and memory 1103; Wherein, processor 1101 can be connected by bus or alternate manner with memory 1103, in described memory 1103, stores program code, and described program code comprises computer-managed instruction.Described processor 1101 is carried out described program code, for:

Determine the transmitting power scope of the radio frequency unit of the first access point AP; The packet sending and receiving information of the described radio frequency unit reporting according to a described AP, determines the packet sending and receiving parameter of every user link of described radio frequency unit; According to the packet sending and receiving parameter of every user link in the described radio frequency unit of determining, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.Described antenna 1102, for receiving the packet sending and receiving information of the radio frequency unit that an AP reports.

Described memory 1103 is also for storing the packet sending and receiving information of the described radio frequency unit that a described AP reports.Alternatively, processor 1101 also, for determining the 2nd AP of RSSI value maximum of signal of received RF unit, obtains the average attenuation between an AP and the 2nd AP, according to the default power threshold of average attenuation and AP, determines the transmitting power scope of AP.

Alternatively, processor 1101 is also used to the default transmitting power of radio frequency unit configuration, so that the default transmitting power of radio frequency unit utilization sends message, default transmitting power is positioned at transmitting power scope.

Alternatively, packet sending and receiving parameter comprises any one in total error ratio when BER, the PER of user link or user link and other user link receive and dispatch message simultaneously.

Alternatively, controller is positioned at access controller AC.

Figure 12 shows the hardware block diagram of the AP that the embodiment of the present invention provides, and this AP is for moving the transmit power controlling method described in Fig. 6 embodiment of the present invention.For convenience of explanation, only show the part relevant to the present embodiment.As shown in figure 12, described AP comprises: processor 1201, antenna 1202, memory 1203 and radio frequency unit 1204; Wherein, processor 1201 can be connected by bus or alternate manner with memory 1203, in described memory 1203, store program code, described program code comprises computer-managed instruction, the radiofrequency signal of the transmitting power that the responsible loading processor 1201 of described radio frequency unit 1204 is indicated, radiofrequency signal is launched by antenna 1202, and the data-signal that antenna 1202 is received is sent into processor 1201 and is processed.

Described antenna 1202, for receiving the transmitting power scope of radio frequency unit 1204 of the AP that controller sends.

Described processor 1201 is carried out described program code, for:

According to the packet sending and receiving information of radio frequency unit 1204, determine the packet sending and receiving parameter of every user link in radio frequency unit 1204.

Described memory 1203, also for storing the packet sending and receiving information of described radio frequency unit 1204, and the packet sending and receiving parameter of every user link in radio frequency unit 1204.

Processor 1202, also for according to described packet sending and receiving parameter, every the user link that is respectively radio frequency unit 1204 within the scope of the described transmitting power receiving at described antenna 1202 is carried out transmitting power configuration.Alternatively, processor 1201 also for determining default transmitting power within the scope of transmitting power.

Described radio frequency unit 1204, loads radiofrequency signal specifically for the default transmitting power of determining within the scope of transmitting power according to processor 1201, and radiofrequency signal is launched by antenna 1202.

Alternatively, packet sending and receiving parameter comprises any one in total error ratio when BER, the PER of user link or user link and other user link receive and dispatch message simultaneously.

In embodiments of the present invention, by determining the transmitting power scope of AP, and within the scope of this transmitting power, dynamically determine the transmitting power of AP in this user link according to the packet sending and receiving situation of every user link of AP, reduce targetedly the signal between equipment in WLAN and disturbed, improved the system transmission performance of WLAN.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a transmit power controlling method for WLAN (wireless local area network), is characterized in that, comprising:
Controller is determined the transmitting power scope of the radio frequency unit of the first access point AP;
The packet sending and receiving information of the described radio frequency unit that described controller reports according to a described AP, determines the packet sending and receiving parameter of every user link of described radio frequency unit;
Described controller is according to the packet sending and receiving parameter of every user link in the described radio frequency unit of determining, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.
2. the method for claim 1, is characterized in that, described controller determines that the transmitting power scope of the radio frequency unit of an AP comprises:
Described controller is determined the 2nd maximum AP of received signal strength indicator symbol RSSI value of the signal that receives described radio frequency unit;
Described controller obtains the average attenuation between a described AP and described the 2nd AP;
Described controller, according to the default power threshold of described average attenuation and a described AP, is determined the transmitting power scope of described radio frequency unit.
3. method as claimed in claim 1 or 2, is characterized in that, before the packet sending and receiving parameter of every user link of determining described radio frequency unit, also comprises:
Described controller is the default transmitting power of described radio frequency unit configuration, so that described radio frequency unit utilizes described default transmitting power to send message, described default transmitting power is positioned at described transmitting power scope.
4. a transmit power controlling method for wireless network, is characterized in that, comprising:
Access point AP receives the transmitting power scope of the radio frequency unit of the described AP of controller transmission;
Described AP, according to the packet sending and receiving information of described radio frequency unit, determines the packet sending and receiving parameter of every user link in described radio frequency unit;
Described AP is according to described packet sending and receiving parameter, and every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.
5. method as claimed in claim 4, is characterized in that,,, before determining the packet sending and receiving parameter of every user link in described radio frequency unit, also comprises according to the packet sending and receiving information of described radio frequency unit at described AP:
Described AP determines described default transmitting power within the scope of described transmitting power;
Described AP utilizes described default transmitting power to send message on described radio frequency unit.
6. a controller, is characterized in that, comprising:
Power bracket determining unit, for determining the transmitting power scope of radio frequency unit of the first access point AP;
Parameter determining unit, for the packet sending and receiving information of the described radio frequency unit that reports according to a described AP, determines the packet sending and receiving parameter of every user link of described radio frequency unit;
Dispensing unit, for receiving described transmitting power scope from described power bracket determining unit, the packet sending and receiving parameter of every user link the described radio frequency unit of determining from described parameter determining unit reception, according to the packet sending and receiving parameter of every user link in the described radio frequency unit of determining, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.
7. controller as claimed in claim 6, is characterized in that, described power bracket determining unit comprises:
The 2nd AP determines subelement, for determining the 2nd maximum AP of received signal strength indicator symbol RSSI value of the signal that receives described radio frequency unit;
Obtain subelement, for determining that from described the 2nd AP subelement receives described the 2nd AP, obtain the average attenuation between a described AP and described the 2nd AP;
Power bracket is determined subelement, for receiving described average attenuation from the described subelement that obtains, according to the default power threshold of described average attenuation and a described AP, determines the transmitting power scope of described radio frequency unit.
8. the controller as described in claim 6 or 7, is characterized in that, also comprises:
Pre-configured unit, for receiving described transmitting power scope from described power bracket determining unit, for the default transmitting power of described radio frequency unit configuration, so that described radio frequency unit utilizes described default transmitting power to send message, described default transmitting power is positioned at described transmitting power scope.
9. an access point AP, is characterized in that, comprising:
Receiving element, for receiving the transmitting power scope of radio frequency unit of the described AP that controller sends;
Parameter determining unit, for according to the packet sending and receiving information of described radio frequency unit, determines the packet sending and receiving parameter of every user link in described radio frequency unit;
Dispensing unit, for receiving described transmitting power scope from described receiving element, receive described packet sending and receiving parameter from described parameter determining unit, according to described packet sending and receiving parameter, every the user link that is respectively described radio frequency unit within the scope of described transmitting power is carried out transmitting power configuration.
10. AP as claimed in claim 9, is characterized in that, also comprises:
Pre-configured unit, for determining described default transmitting power within the scope of described transmitting power;
Transmitting element for receiving described default transmitting power from described pre-configured unit, utilizes described default transmitting power to send message on described radio frequency unit.
CN201210417328.4A 2012-10-26 2012-10-26 Transmit power control method for wireless local area network , controller and access point CN103781165A (en)

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EP20130189415 EP2725854A1 (en) 2012-10-26 2013-10-18 Method for controlling transmit power in wireless local area network, controller, and access point
IN4722CH2013 IN2013CH04722A (en) 2012-10-26 2013-10-21
US14/063,614 US20140119220A1 (en) 2012-10-26 2013-10-25 Method for controlling transmit power in wireless local area network, controller, and access point
RU2013147769/07A RU2562250C2 (en) 2012-10-26 2013-10-25 Control over power of transmission in wireless local network, controller and access point

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RU2562250C2 (en) 2015-09-10

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